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According to an embodiment, a permanent magnet comprises : a base magnet written by a-b-c, wherein a has a rare-earth element, b has a transition element, and c has boron (B); and a coating layer coated on a surface of the base magnet. The coating layer has a compound including metal that has magnetism. The compound comprises : phosphorus (P); and metal belonging to Period 4 of the periodic table.COPYRIGHT KIPO 2018